Elton was forced to cut his concert dates in Auckland, New Zealand, in half due to his symptoms.
Addressing the crowd, he said: “I’ve just completely lost my voice. I can’t sing. I’ve got to go. I’m sorry,” he added, before being helped off stage.
Taking to Instagram, Elton made the emotional admission: “I want to thank everyone who attended tonight’s gig in Auckland. I was diagnosed with walking pneumonia earlier today, but I was determined to give you the best show humanly possible.
“I played and sang my heart out, until my voice could sing no more. I’m disappointed, deeply upset and sorry. I gave it all I had.
“Thank-you so much for your extraordinary support and all the love you showed me during tonight’s performance. I am eternally grateful. Love, Elton,” he finished.